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The Effect of Oryzalin on Growth and Gravitropism in Arabidopsis Roots

Journal of Life Science 2021년 31권 2호 p.109 ~ 114
고진규, 박선일, 김순영,
소속 상세정보
고진규 ( Go Jin-Gyu ) - Andong National University School of Biotechnology
박선일 ( Park Sun-Ill ) - Andong National University School of Biotechnology
김순영 ( Kim Soon-Young ) - Andong National University School of Biotechnology

Abstract


Oryzalin is a dinitroaniline herbicide that has been known to disrupt microtubules. Microtubules and microfilaments are components of cytoskeletons that are implicated in plant cell growth, which requires the synthesis of cellulose when cell walls elongate. In addition, microtubules are also involved in the sedimentation of statoliths, which regulate the perception of gravity in the columella cells of root tips. In this study, we investigated the effect of oryzalin on the growth and gravitropic response of Arabidopsis roots. The role of ethylene in oryzalin’s effect was also examined using these roots. Treatment of oryzalin at a concentration of 10-4 M completely inhibited the roots’ growth and gravitropic response. At a concentration of 10-6 M oryzalin, root growth was inhibited by 47% at 8 hr when compared to control. Gravitropic response was inhibited by about 38% compared to control in roots treated with 10-6 M oryzalin for 4 hr. To understand the role of oryzalin in the regulation of root growth and gravitropic response, we measured ethylene production in root segments treated with oryzalin. It was found that the addition of oryzalin stimulated ethylene production through the activation of ACC oxidase and ACC synthase genes, which are key components in the synthesis of ethylene. From these findings, it can be inferred that oryzalin inhibits the growth and gravitropic response of Arabidopsis roots by stimulating ethylene production. The increased ethylene alters the arrangement of the microtubules, which eventually interferes with the growth of the cell wall.

키워드

Arabidopsis root; ethylene; gravitropic response; growth; oryzalin

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